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Difficulty: MediumPhysiological Adaptation

A trauma client is admitted to the critical care unit with a radiographically confirmed fracture of the C5 vertebra following a motor vehicle collision. During the ongoing physical assessment, the nurse monitors for systemic complications associated with a high cervical cord injury. Which specific clinical presentation most accurately indicates that the client is developing neurogenic shock?

  1. Bradycardia combined with warm, flushed extremitiesAnswer
  2. B
    Tachycardia combined with cool, pale, and diaphoretic skin
  3. C
    Complete absence of deep tendon reflexes and flaccid paralysis
  4. D
    Sudden onset of severe hypertension and a pounding headache

Answer

Bradycardia combined with warm, flushed extremities
Neurogenic shock is a distributive type of shock that occurs after a spinal cord injury, typically at the T6 level or above. The injury disrupts the sympathetic nervous system pathways, resulting in a loss of vasomotor tone and an unopposed parasympathetic (vagal) response. This physiological alteration leads to massive peripheral vasodilation (causing warm, flushed extremities) and an inability of the heart to mount a compensatory tachycardia, resulting in characteristic bradycardia. This presentation is unique among shock states.

Step-by-Step Solution

1
Identify the underlying pathophysiology of neurogenic shock following a high cervical spine injury.
The injury disrupts the sympathetic nervous system pathways, leaving parasympathetic (vagal) tone unopposed.
High cervical injuries (above T6) sever the communication between the brainstem and the sympathetic ganglia.
2
Correlate the pathophysiology with the expected hemodynamic changes.
The loss of sympathetic tone causes profound vasodilation and prevents the heart from increasing its rate.
Without sympathetic stimulation, blood vessels relax (causing warm, flushed skin and hypotension) and the parasympathetic system slows the heart rate (bradycardia).
3
Differentiate neurogenic shock from other complications associated with trauma.
Eliminate hypovolemic shock (tachycardia/cool skin), spinal shock (purely neurological loss of reflexes), and autonomic dysreflexia (severe hypertension).
Accurate differentiation ensures that life-saving interventions specific to the underlying physiological failure are initiated.

Key Concept

Hemodynamic presentation and physiological mechanism of neurogenic shock
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Topics

Physiological Adaptation

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